/Engine/Source/Runtime/Engine/Classes/Animation/TimeStretchCurve.h
Updates InOutMarkerIndex as needed based on 'InPosition' in 'InMarkerPositions' So that InOutMarkerIndex satisfies 'IsValidMarkerForPosition'
void UpdateMarkerIndexForPosition ( int32 & InOutMarkerIndex, float InPosition, const [TArray](API\Runtime\Core\Containers\TArray)< float > & InMarkerPositions ) const